Absolute value measurement of ion-scale turbulence by two-dimensional phase contrast imaging in Large Helical Device

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説明

Absolute value measurements of turbulence amplitude in magnetically confined high-temperature plasmas can effectively explain turbulence-driven transport characteristics and their role in plasma confinements. Two-dimensional phase contrast imaging (2D-PCI) is a technique to evaluate the space-time spectrum of ion-scale electron density fluctuation. However, absolute value measurement of turbulence amplitude has not been conducted owing to the nonlinearity of the detector. In this study, the absolute measurement method proposed in the previous study is applied to turbulence measurement results in the large helical device. As a result, the localized turbulence amplitude at n_e = 1.5 × 10^<19> m^<-3> is approximately 3.5 × 10^<15> m^<-3>, which is 0.02% of the electron density. In addition, the evaluated poloidal wavenumber spectrum is almost consistent, within a certain error range, the spectrum being calculated using a nonlinear gyrokinetic simulation. This result is the first to the best of our knowledge to quantitatively evaluate turbulence amplitudes measured by 2D-PCI and compare with simulations.

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詳細情報 詳細情報について

  • CRID
    1050865187564199040
  • ISSN
    17480221
  • HANDLE
    2324/7174416
  • 資料種別
    journal article
  • データソース種別
    • IRDB

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